Migrating Birds Often Cross the Gulf of Mexico in a Single

Multiple Choice

Migrating birds often cross the Gulf of Mexico in a single flight thus their flight muscles demand extreme endurance.An examination of the muscles used to perform this activity would reveal

A) little to no myoglobin.
B) one-to-two nuclei per muscle fiber.
C) an abundance of blood vessels.
D) a high number of intercalated discs.
E) numerous gap junctions.